CN113076629B - Control method for heat treatment process of high-strength wire rod - Google Patents
Control method for heat treatment process of high-strength wire rod Download PDFInfo
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 141
- 238000000034 method Methods 0.000 title claims abstract description 66
- 230000008569 process Effects 0.000 title claims abstract description 44
- 238000004519 manufacturing process Methods 0.000 claims abstract description 22
- 230000009466 transformation Effects 0.000 claims abstract description 22
- 239000000126 substance Substances 0.000 claims abstract description 17
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 14
- 239000010959 steel Substances 0.000 claims abstract description 14
- 238000012417 linear regression Methods 0.000 claims abstract description 3
- 239000000203 mixture Substances 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 239000011572 manganese Substances 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 2
- 229910052748 manganese Inorganic materials 0.000 claims description 2
- 238000012360 testing method Methods 0.000 abstract description 5
- 238000010924 continuous production Methods 0.000 abstract description 3
- 238000004886 process control Methods 0.000 abstract description 3
- 238000004088 simulation Methods 0.000 abstract description 3
- 239000013072 incoming material Substances 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 13
- 230000009467 reduction Effects 0.000 description 9
- 238000012937 correction Methods 0.000 description 5
- 230000014509 gene expression Effects 0.000 description 5
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 description 4
- 229910001335 Galvanized steel Inorganic materials 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 239000008397 galvanized steel Substances 0.000 description 3
- 229910000734 martensite Inorganic materials 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000007405 data analysis Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 239000010955 niobium Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000006032 tissue transformation Effects 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
- 238000005491 wire drawing Methods 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2111/00—Details relating to CAD techniques
- G06F2111/04—Constraint-based CAD
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/08—Thermal analysis or thermal optimisation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
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Abstract
The application discloses a control method of a heat treatment process of a high-strength wire rod, which comprises the following steps: acquiring heat treatment historical data of the wire rod; establishing a wire rod mechanical property model according to historical data through a linear regression equation; based on a wire rod mechanical property model, taking chemical components and specification parameters of the wire rod as input, and taking the mechanical property requirement of the wire rod after heat treatment as a target to establish constraint conditions so as to obtain a heat treatment process range; and combining the isothermal transformation curve of the wire rod steel grade to obtain the optimal heat treatment process. The process control method can quickly determine the heat treatment production process, and omits a large number of simulation tests and production debugging processes; during continuous production, the heat treatment process can be dynamically adjusted according to the changes of the components and the specifications of the incoming materials, so that the performance fluctuation of the wire rods of different furnace batch numbers due to the component difference is minimized, and the performance stability of the heat treatment wire rods is improved.
Description
Technical Field
The application relates to the field of heat treatment of steel wires, in particular to a control method of a heat treatment process of a high-strength wire rod.
Background
Galvanized steel wires and steel strands for bridge cables are important materials for the construction of modern large-scale bridges. With the development of bridge industry technology, the tensile strength level of the large-span suspension bridge and the inclined pull bridge on galvanized steel wires for main cables and inclined pull cables is improved to be more than 1960MPa, and the torsion index is met, namely the performance index of the wire rods for raw materials, namely the cable steel wires, is correspondingly improved. The high-strength cable steel wire is used, so that the weight of the bridge can be reduced, the installation and maintenance cost can be reduced, and the safety coefficient of the bridge can be improved. Therefore, how to improve the strength and stability of wire rods for cable wires has become a problem to be solved.
The wire rod produced by adopting the traditional method of controlled cooling after rolling has limited strength and large performance fluctuation, and is only suitable for producing products below 1860 MPa. The performance of the wire rod can be improved by performing post-rolling heat treatment on the wire rod, so that a high-strength wire rod with uniform and stable tissue performance can be obtained, and the requirements of 1960MPa and higher-grade bridge cable galvanized steel wires on wire rod raw materials can be met.
In the prior art, patent CN 106636581A discloses a 1960MPa and more grade bridge cable lock zinc wire rod salt bath treatment method, patent CN 110205473A discloses a heat treatment method for improving the uniformity of the ultra-high strength cable wire rod structure, and the two patents reduce the strength fluctuation of the wire rod and improve the structure performance stability by austenitizing and isothermal salt bath quenching of the hot rolled wire rod. The wire rod is heated to austenitize and then subjected to isothermal sorbite transformation to achieve the aim of improving and stabilizing the performance of the wire rod, but when a heat treatment process is formulated for a certain new component or a new specification wire rod in heat treatment production, a series of heat treatment simulation tests are usually required to determine relevant process parameters, and due to different conditions such as equipment states of a laboratory and a heat treatment production workshop, mass production debugging is required to finally determine the heat treatment process. The traditional process planning method is labor-consuming and low in efficiency through multiple production debugging and inspection.
In recent years, as big data analysis technology starts to develop and apply in many industries, big data systems such as MES system, ERP system and collaborative office platform have been applied in many iron and steel enterprises. How to effectively utilize the established big data platform to guide production becomes a popular research direction of a plurality of enterprises. In the aspect of heat treatment production of wire rods, how to rapidly prepare a production process according to the prior production data, and dynamically control the heat treatment process to improve the performance stability.
Disclosure of Invention
The invention aims to provide a control method for a heat treatment process of a high-strength wire rod, which aims to overcome the defects in the prior art.
In order to achieve the above purpose, the present invention provides the following technical solutions: a control method for a heat treatment process of a high-strength wire rod comprises the following steps:
(1) Collecting the existing data of a heat treatment production line, wherein the production process data at least comprise heat treatment temperature and wire rod running speed, the test data at least comprise wire rod chemical composition, diameter and mechanical property data, the production process data and the test data are connected in series by adopting a furnace batch number as a key variable, and the heat treatment time t, t=L/V is calculated, wherein L is the isothermal tank length, and V is the wire rod running speed;
(2) Establishing a wire rod performance prediction model through performance data of produced products, taking chemical components, diameter, heat treatment temperature and heat treatment time of the wire rod as input variables, taking tensile strength and reduction of area as target variables, and adopting a linear regression mode to construct a wire rod mechanical performance model;
(3) Before heat treatment production, chemical composition and diameter information of a pre-produced wire rod are called, the chemical composition and the diameter information are taken as input variables and are put into a mechanical property model, mechanical property requirements are taken as constraint conditions, and heat treatment temperature and heat treatment time interval are solved;
(4) And combining the isothermal transformation curve of the steel grade, selecting the heat treatment temperature and time, and formulating a heat treatment process, wherein the intermediate value in the selected range is a preferred value.
In the technical scheme, the wire rod heat treatment principle is that after the hot rolled wire rod is completely austenitized, the hot rolled wire rod rapidly enters an isothermal tank to carry out isothermal sorbite phase transformation, and a cooling medium in the isothermal tank is usually molten salt, molten lead, aqueous solution and the like. Because the isothermal temperature is accurately controlled and the fluctuation is small, the obtained sorbite tissue pellets are fine and uniform, the sheet interval is small and the sorbite rate is high, thereby achieving the purpose of simultaneously improving the strength, the plasticity and the toughness of the wire rod.
In the process of heat treatment of the wire rod, after complete austenitizing, the heat treatment process parameters determining the tissue performance of the wire rod mainly comprise isothermal temperature and isothermal time, wherein the isothermal temperature is generally determined by isothermal medium temperature, namely heat treatment temperature, and the isothermal heat treatment time is generally determined by wire rod running speed.
According to the invention, through analyzing the wire rod heat treatment process data of different components and specifications, the wire rod performance after heat treatment has a certain linear correlation with the incoming material components, the specifications, the heat treatment temperature, the isothermal heat treatment time and the like, and a mechanical property prediction model can be established according to the produced data. For the new component or new specification wire rod, before heat treatment production, according to the established performance model, chemical components and specification parameter information are used as input variables, and mechanical property technical requirements are used as constraint conditions, and the heat treatment process parameters, namely the heat treatment temperature and the heat treatment time range, can be solved.
The range of the heat treatment process parameters solved by the model is only one basic condition required to meet the performance target requirement, when the wire rod is subjected to isothermal transformation in an isothermal tank in the actual heat treatment production process, the transformation completion time on the isothermal transformation curve is reached as much as possible, if the actual heat treatment time is smaller than the transformation completion time, the transformation is incomplete, the residual austenite is possibly transformed into martensite, and the martensite is a hard and brittle structure, at the moment, although the strength of the wire rod is improved, the toughness and plasticity of the wire rod are reduced due to the martensite appearing in the structure, brittle fracture is easy to occur in the subsequent drawing process of a user, and serious catastrophic accidents are also possibly caused in engineering application.
Therefore, on the basis of the model solving result, the isothermal transformation curve of the steel grade is combined, the optional range of the heat treatment process is finally determined, on the basis of meeting the performance target requirement, the sufficient progress of tissue transformation is ensured, the intermediate value in the optimal range is used as a process control target, and after the heat treatment temperature and the heat treatment time are selected, the wire rod linear velocity can be calculated, and the heat treatment process can be further determined.
Compared with the prior art, the control method of the high-strength wire rod heat treatment process establishes a heat treatment wire rod mechanical property prediction model through data analysis before heat treatment; based on the model, constraint conditions are established by taking the performance requirement of the wire rod after heat treatment as a target, and the heat treatment process is rapidly formulated and adjusted according to the component specification change of the incoming wire rod, so that a large number of simulation tests and production debugging are saved. During continuous production, the performance of the wire rod after heat treatment can be predicted and dynamically controlled, and when the performance meets the requirement, the original heat treatment process is kept unchanged; when the predicted performance does not meet the requirement, the heat treatment parameters are dynamically adjusted according to the model, so that the mechanical properties of the wire rods after heat treatment meet the requirement, and under the condition, the performance fluctuation of the wire rods of different furnace batch numbers due to the component difference can be reduced to the minimum, so that the performance stability of the heat treatment wire rods is improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings may be obtained according to the drawings without inventive effort to those skilled in the art.
FIG. 1 is a graph of the range of heat treatment parameters plotted by model solving in conjunction with isothermal transformation curves according to embodiment 1 of the present invention;
FIG. 2 is a graph of the range of heat treatment parameters plotted by model solving in conjunction with isothermal transformation curves according to embodiment 2 of the present invention;
FIG. 3 is a graph of the range of heat treatment parameters plotted by model solving in combination with isothermal transformation curves according to embodiment 3 of the present invention;
FIG. 4 is a graph of the range of heat treatment parameters plotted by model solving in conjunction with isothermal transformation curves according to embodiment 4 of the present invention;
FIG. 5 is a graph of the range of heat treatment parameters plotted by model solving in conjunction with isothermal transformation curves according to embodiment 5 of the present invention.
Detailed Description
The following detailed description of the technical solutions according to the embodiments of the present invention will be given with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
A control method for heat treatment process of high-strength wire rod includes collecting the data of heat treatment production line and constructing heat treatment wire rod performance model, calling the chemical composition and diameter information of pre-produced wire rod before heat treatment production, taking them as input variables into mechanical property model, taking mechanical property requirement as constraint condition, solving heat treatment temperature and heat treatment time range, combining isothermal transformation curve of steel grade, selecting heat treatment temperature and time and making heat treatment process.
In the mechanical property model established in the embodiment, in the input variables, the chemical components of the wire rod adopt the weight percentages of three elements including carbon, silicon and manganese, and it should be noted that the embodiment is not limited to the three elements, and other elements such as aluminum, chromium, titanium, vanadium and niobium are adopted as the same materials for the embodiment, and the mechanical property model established in the embodiment is as follows:
In the method, in the process of the invention,
Rm: tensile strength, MPa;
Z: shrinkage in area,%;
phi: wire rod diameter, mm;
t: heat treatment temperature, DEG C;
t: heat treatment time s;
[C] : carbon content of wire rod,%;
[ Si ]: the silicon content of the wire rod,%;
[ Mn ]: manganese content of wire rod,%.
Based on the mechanical property model, an example of a heat treatment process control method is given below.
In particular, the strength and the reduction of area of the wire rod are generally defined to be at least a certain minimum value among the performance requirements after the heat treatment of the wire rod. However, in the actual production process, the higher the strength is, the better the strength is, the insufficient margin of the strength is caused, even the strength level requirement cannot be met, the toughness of the wire rod is reduced due to the fact that the strength is too high, the wire breakage rate is easily increased in the later user processing or wire drawing process, therefore, the strength of the wire rod after heat treatment is stable in a certain optimal range, and constraint conditions are established by taking the optimal range as a target for the strength of the wire rod. In order to improve the toughness of the wire rod, the reduction of area should be modified by adding a certain margin on the basis of the minimum value, and a constraint condition is established according to the modified reduction of area requirement.
The incoming wire rod comprises the following main chemical components: c0.87%, si0.28%, mn0.78%, the specification is phi 14mm, the strength requirement of the wire rod after heat treatment is more than 1350MPa, the optimal range is 1370-1380MPa, the area reduction requirement is more than 35%, and the correction requirement is more than 38%.
1. The wire rod components and diameter parameters are brought into the constructed model expressions (1) and (2), and constraint conditions are established as follows:
1370≤1090.222-20.686×14-0.608×T+0.057×t+521.764×0.87+250.576×0.28+436.355×0.78≤1380
229.176+0.342×14-0.121×T-0.007×t-150.776×0.87+2.253×0.28-1.283×0.78≥38
the solution can be obtained, T is not less than 468.9 ℃ and not more than 514.4 ℃, T is not more than 419.0s, and the technological parameter range of model solution is shown in figure 1.
2. The selectable ranges of the heat treatment temperature and the heat treatment time are shown in fig. 1 by combining the isothermal transformation curve of the steel grade, wherein the intermediate value in the selected range, namely the heat treatment temperature T is 509 ℃, and the heat treatment time T is 340s.
3. According to the heat treatment time t of 340s, calculating the wire rod running speed V of 1.9m/min, wherein the finally obtained heat treatment process is that the heat treatment temperature is 509 ℃, and the wire rod running speed is 1.9m/min.
Example 2
Example 2 differs from example 1 in that the incoming wire rod has the main chemical components: c0.86%, si0.88%, mn0.50%, the specification is phi 14mm, the strength requirement of the wire rod after heat treatment is 1360MPa or more, the optimal range is 1380-1390MPa, the area reduction requirement is 36% or more, and the correction requirement is 40% or more.
1. The wire rod components and diameter parameters are brought into the constructed model expressions (1) and (2), and constraint conditions are established as follows:
1380≤1090.222-20.686×14-0.608×T+0.057×t+521.764×0.86+250.576×0.88+436.355×0.50≤1390
229.176+0.342×14-0.121×T-0.007×t-150.776×0.86+2.253×0.88-1.283×0.50≥40
The solution can be obtained, T is not less than 490.2 ℃ and not more than 528.8 ℃, T is not more than 345.0s, and the technological parameter range of model solution is shown in figure 2.
2. The selectable ranges of the heat treatment temperature and the heat treatment time obtained by combining the isothermal transformation curve of the steel grade are shown in fig. 2, and the intermediate value in the selected range, namely the heat treatment temperature T is 523 ℃, and the heat treatment time T is 280s.
3. And calculating the wire rod running speed V to be 2.3m/min according to the heat treatment time t of 280s, wherein the finally obtained heat treatment process is that the heat treatment temperature is 523 ℃, and the wire rod running speed is 2.3m/min.
Example 3
Example 3 differs from example 1 in that the incoming wire rod has the main chemical components: c0.92%, si1.15%, mn0.50%, specification phi 13mm, wire rod strength requirement after heat treatment is 1480MPa or more, optimum range is set to 1500-1510MPa, area reduction rate requirement is 30% or more, and correction requirement is 33% or more.
1. The wire rod components and diameter parameters are brought into the constructed model expressions (1) and (2), and constraint conditions are established as follows:
1500≤1090.222-20.686×13-0.608×T+0.057×t+521.764×0.92+250.576×1.15+436.355×0.50≤1510
229.176+0.342×13-0.121×T-0.007×t-150.776×0.92+2.253×1.15-1.283×0.50≥33
the solution can be obtained, T is less than or equal to 489.6 ℃ and less than or equal to 519.5 ℃, T is less than or equal to 251.7s, and the technological parameter range of model solution is marked in figure 3.
2. The selectable ranges of the heat treatment temperature and the heat treatment time obtained by combining the isothermal transformation curves of the steel types are shown in fig. 3, and the intermediate value in the selected range, namely the heat treatment temperature T is 513 ℃, and the heat treatment time T is 200s.
3. According to the heat treatment time t of 200s, calculating the wire rod running speed V of 3.3m/min, wherein the finally obtained heat treatment process is that the heat treatment temperature is 513 ℃, and the wire rod running speed is 3.3m/min.
Example 4
Example 4 differs from example 1 in that the incoming wire rod has the main chemical components: c0.92%, si1.16%, mn0.50%, specification of phi 14mm, strength requirement of coil rod after heat treatment of 1460MPa or more, optimum range of 1480-1490MPa, area reduction requirement of 30% or more, and correction requirement of 33% or more.
1. The wire rod components and diameter parameters are brought into the constructed model expressions (1) and (2), and constraint conditions are established as follows:
1500≤1090.222-20.686×13-0.608×T+0.057×t+521.764×0.92+250.576×1.15+436.355×0.50≤1510
229.176+0.342×13-0.121×T-0.007×t-150.776×0.92+2.253×1.15-1.283×0.50≥33
the solution can be obtained, T is not less than 492.6 ℃ and not more than 522.5 ℃, T is not more than 251.9s, and the technological parameter range of model solution is marked in figure 4.
2. In combination with the isothermal transformation curve of the steel grade, the selectable ranges of the heat treatment temperature and the heat treatment time are shown in fig. 4, and the intermediate value in the selected range, namely the heat treatment temperature T is 516 ℃, and the heat treatment time T is 188s.
3. And calculating the wire rod running speed V to be 3.5m/min according to the heat treatment time t of 188s, wherein the finally obtained heat treatment process is that the heat treatment temperature is 516 ℃, and the wire rod running speed is 3.5m/min.
Example 5
Example 5 differs from example 1 in that the incoming wire rod has the main chemical composition: c0.86%, si0.89%, mn0.49%, the specification is phi 13mm, the strength requirement of the wire rod after heat treatment is more than 1350MPa, the optimal range is set to 1390-1400MPa, the area reduction requirement is more than 35%, and the correction requirement is more than 38%.
1. The wire rod components and diameter parameters are brought into the constructed model expressions (1) and (2), and constraint conditions are established as follows:
229.176+0.342×13-0.121×T-0.007×t-150.776×0.86+2.253×0.89-1.283×0.49≥38
1390≤1090.222-20.686×13-0.608×T+0.057×t+521.764×0.86+250.576×0.89+436.355×0.49≤1400
The solution can be obtained, the temperature T is not less than 504.7 ℃ and not more than 543.0 ℃, the temperature T is not more than 341.5s, and the technological parameter range of model solution is shown in figure 5.
2. In combination with the isothermal transformation curve of the steel grade, the selectable ranges of the heat treatment temperature and the heat treatment time are shown in fig. 5, and the intermediate value in the selected range, namely the heat treatment temperature T is 535 ℃, and the heat treatment time T is 240s.
3. According to the heat treatment time t of 240s, the wire rod running speed V is calculated to be 2.7m/min, and the finally obtained heat treatment process is that the heat treatment temperature is 535 ℃, and the wire rod running speed is 2.7m/min.
The above-described embodiments 1 to 5 are coil heat treatment processes formulated by the method of the present invention, omitting mass production debugging required due to variations in coil composition, specification, etc. In addition, in the continuous production process, aiming at the component difference of the wire rods with different furnace batch numbers, the method is adopted to finely adjust the heat treatment process, and after the heat treatment process is dynamically controlled by the method, the strength fluctuation of the wire rods with the same grade is reduced from the original 53MPa to within 30MPa, so that the performance stability of the heat treatment wire rods is improved.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.
The foregoing is merely exemplary of the application and it will be appreciated by those skilled in the art that variations and modifications may be made without departing from the principles of the application, and it is intended that the application also be limited to the specific embodiments shown.
Claims (1)
1. A control method for a heat treatment process of a high-strength wire rod is characterized by comprising the following steps of: comprising the following steps:
Step 1, acquiring historical data of a heat treatment production line, wherein the historical data comprises: chemical composition, diameter and mechanical property data of the wire rod, heat treatment temperature during heat treatment, wire rod wire speed and heat treatment time;
The heat treatment time satisfies the following conditions:
t=L/V
wherein: t is heat treatment time, L is isothermal groove length, and V is wire rod running speed;
step 2, establishing a mechanical property model of the wire rod, wherein a linear regression equation is adopted to take the chemical components, the diameter, the heat treatment temperature and the heat treatment time of the wire rod as input variables, and the tensile strength and the area shrinkage of the wire rod as target variables;
The wire rod mechanical property model is as follows:
；
wherein: : tensile strength; /(I) : Shrinkage of the area; /(I): Wire rod diameter; /(I): A heat treatment temperature; /(I): Heat treatment time; /(I): Carbon content of the wire rod; /(I): The silicon content of the wire rod; /(I): Manganese content of the wire rod;
Step 3, acquiring chemical composition and diameter data of the pre-heat treatment wire rod, substituting the chemical composition and diameter data into the wire rod mechanical property model, and obtaining a section of heat treatment temperature and heat treatment time meeting the requirements by taking the wire rod mechanical property requirement as a constraint condition;
and 4, combining an isothermal transformation curve of the wire rod steel grade, further reducing the interval of the heat treatment temperature and the heat treatment time, and selecting an intermediate value in the interval range as an optimal value.
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